Guide-operating means for band-saw mills.



Patented Mar. 4, I902.

' E. E. THOMAS.

GUIDE OPERATING MEANS FOR BAND SAW MILLS.

(Application filed Nov. 11, 1901.)

2 Sheets-Sheet L (No Model.)

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THE NORMS PETERS 00., mm'aumc. WASHI Patented Mar. 4, 1902.

E. THOMAS. I GUIDE OPERATING MEANS FQR BAND SAW MILLS.

(Application flied Nov. 11. 1901) 2 Sheets-Sheet 2,

(No Model.)

. //v YE/V TOR ED WIN 5. THOMAS B) V W/T/vEssEs H/s AT o /vsys UNITED ST TES PATENT 'OFFICE.

EDWIN E. THOMAS, OF ST.-PAUL, MINNESOTA, ASSIGNOR OF ONE-HALF TO UNION IRON WORKS, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA. I

GUIDE-OPERATING 'MEANS' FOR BAND-SAW MILLS SPECIFICATION forming part of Letters Patent No. 694,697, dated March 4, 1902.

Application filed November 11, 1901. Serial No. 81,803. illo model.)

To aZZ whom it may concern: a on a casting 12 is slidable. 'The casting 12is Be it known that I, EDWIN E. THOMAS, of provided with sleeves ll, preferably integral St. Paul, Ramsey county, Minnesota, havein: therewith, to receive the ends of shafts 15, vented certain new and useful Improvements 'whereon the freely-swinging guide-arms 16 are in Guide Operating Means for Band Saw hung between adjustable clamp-collars 17.

Mills, of which the following is a specifica One of the swinging arms 16 is provided tion. 7 V with a counterbalance-weight 18 and with a In the operation of band-saw mills itis necbearing 19 for an antifriction-wheel 20. In essary to raise and lower the uppersaw-guide case the guide is set too low on the saw for [O to adjust it according to the diameter of the the diameter of the log that is to be sawed,

log that is being sawed. The mechanism herethe end of the log will strike the antifrictiontofore employed for this purpose is clumsy wheel below-its center and raise the guide. and slow of operation and is located where it Without the employment of this wheel the interferes more or less with the other mechlog would strike the end of the guide and I5 anism of the mill. break the same or jam it against the saw or The object, therefore, of my invention is to otherwise cause damage to the band-mill and provide a conveniently-operated means for' interfere with'its operation. effecting a quick accurate movement of the ,21 represents the guide proper, having jaws saw-guide. 22, provided with a space between them to 20 A further object is to arrange the guide raise the saw. 7 It frequentlyhappens in sawraising and lowering means where it will not ing that the guide has to be raised or lowered be in the way of the operator or any of the to accommodate it to logs of different diameoperating mechanism and will not accumuter. As large logs may be mixed with the late sawdust and other refuse material from small ones, the operator is obliged to raise 25 the saw. and lower the guide a number of times daily The invention consists generallyin provid; during the operation of the mill. To ening a band-saw mill with a steam-cylinderloable the operator to handle the guide quickly cated on the opposite side of the upper bandand easily, I provide a swaybar 22, pivwheel shaft from the saw-guide, the piston of oted on a short stud 23 near, the top of one 30 said cylinder having oscillating connections of the brackets 3, one end of said bar be with the saw-guide. ing connected by a rod 24: with the casting 12. Further, the invention consists in various The other end of the bar overhangs the base constructions and combinations, all as hereof the mill on the opposite side of the upper inafter described, and particularly pointed band-wheel shaft from the saw-guide, and on 3 5 out in the claims. the base at this point I arrange a steam-cyl- 8 5 In the accompanying drawings, forming inder 26, having its piston 25 connected with part of this specification, Figure 1 is a plan the overhanging end of said sway-bar. I conview of a band-mill embodying my invensider the arrangementtof a cylinder in this tion. Fig. 2 is a rear view of the same. position as the important feature of my in- 40 In the drawings, 2represents the band-mill vention, as it removes the cylinder from all base, provided with upright brackets 3 3, havdanger of interference with the other meching vertical bearings for the sliding columns anism of the mill and locates it where it will i 4, whereon the shaft 5 of the upper bandbe free from the sawdust and other refuse wheel 6 is supported. that accumulate around the saw. The cyl- 45 7 represents the lower band-wheel, and 8 inder is provided with a slide-valve 27, havits shaft suspended in adjustable bearings 9 ing inlet and exhaust pipes 28 and 29. The on the mill-base. valve 27 is so arranged that when it is in its 10 represents a substantially V shaped normal position steam will be admitted to each bracket provided .on one of the brackets 3 side of the piston and the piston will be locked so and has avertical bearing-surface 11, whereagainst movement in either direction. The

is also secured on said shaft and connected by a rod 34 with an operating-lever 35, that is pivoted on the base of the mill. The lower end of the lever 35 has a weight 36, which normally tends to hold said lever in a vertical position and allow the steam to enter through the valve 27 to both ends of the cylinder.

To operate the guide, the operator moves the lever and shuts off the steam from one side of the piston. The saw-guide will then be moved up and down, according to the direction the lever is moved. As soon as the lever is released the weight will cause it to automatically assume a vertical position.

I claim as my invention 1. In a band-mill, the combination, with a base having upright brackets, of the upper band-wheel and its shaft supported on said brackets, a saw, a vertically-movable sawguide, an engine arranged on the opposite side of the upper band-wheel shaft from said guide to remove it from the dust and dirt of the saw and from interfering with the work of the operator, means for controlling said engine, and a lever pivoted on one of said brackets and having its ends connected respectively with said engine and with said guide, substantially as described and for the purpose specified.

, 2. The combination, with a band-mill base provided with upright brackets, of the upper and lower band-wheels and the saw thereon, a vertically-sliding saw-guide, a steam-cylinder, a sway-bar connected respectively to said guide and the piston of said cylinder and pivoted at an intermediate point on one of said brackets, and a lever having operative connections with the cylinder-valve.

3. In a band-mill, the combination, with a sawmill-base provided with suitable brackets or supports, of the upper band-wheel and its shaft supported on said brackets, a verticallymovable saw-guide, a sway-bar pivoted at a point intermediate to its ends on one of said brackets above said shaft and said guide, an engine provided on the side of said shaft and said brackets opposite said guide and the saw,

"whereby it is removed from the dust and dirt of the saw and from interfering with the Work of the operator, means pivotally connecting the ends of said sway-bar with said guide and engine, and an operating-lever fol-controlling said engine.

In witness whereof I have hereunto set my hand this 7th day of November, 1901.

ED \VIN E. THOMAS.

In presence of- RICHARD PAUL, M. C. NOONAN. 

